Brush-holder.



Patented Feb. 6, 1900.

P. OSHAUGHNESSY.

BRUSH HOLDER.

(Application filed Man 14, 1899.) (No Model.) 2 Sheets-Sheet I.

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BRUSH HOLDER.

(Application filed Mar. 14, 1899.) (No Model.) 7 2 Sheets-Sheet 2.

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%m;z z/ g L Pazrjck U'Shgqghnesqy UNITED STATES PATENT OFFICE.

PATRICK OSI-IAUGHNESSY, OF NEW' YORK, N. Y.

BRUSH-HOLDER.

SPECIFICATION forming part of Letters Patent No. 643,000, dated February 6, 1900.

Application filed March 14,1899. Serial No. 708,998. (No model.)

To ctZZ whom it may concern.-

Be it known that I, PATRICK OSHAUGH- NESSY, a citizen of the United States of America, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Brush- Holders, of which the following is a specification.

The object of this invention is to produce a mounting for brushes that will hold them securely in good electrical contact with their rigid support and with their commutator and permit them to advance radially to the commutator without alteration of bearing on the commutator.

The brush-holder consists of abracket and one or more spring-controlled brush-clamps in which the brushes are adjustable. The principal features of the invention are the manner of mounting the brushes and the brush-clamps, whereby accurate sliding contact radial to the commutator and proper adjustability for the brushes are secured, so that at all times and with either direction of rotation of the commutator a perfect bearing of the brushes on the commutator is maintained.

In the accompanying two sheets of drawings, which form apart of this specification, Figure 1 is a perspective View showing a brush-holder and brushes properly mounted and in contact with the commutator. Fig. 2 is a cross-section on line 00 00 of Fig. 1. Fig. 3 is a perspective view of the bracket. Fig. 4. is a perspective view of a brush-clamp, partly broken away. Fig. 5 is a perspective view of one of the brushes, which is preferably of carbon.

The brush-holder bracket A,as shown in Fig. 1, extends longitudinally along the commutator O and is mounted upon a ring R, which is supported on the frame of the machine. The bracket is an L-shaped piece of brass, with a long arm which extends over the commutator and supports the brushes B and a short arm on which is a square stud having a round threaded end S. This stud S passes through an eye on the ring from which it is insulated, and on the threaded ends are screwed nuts N. As indicated in Fig. 1, the connecting-wire may be attached between these nuts. The

tor.

long arm of the bracket is provided with two fiat parallel faces called contact-faces, with which the brush-clamp contacts. To provide for mounting the brush-clam p, slots 19 b b are cut through the long arm of the bracket and at right angles to the length of the arm.

The brush-clamps consist,essentially,of two pairs of jaws, one for clamping the brush and the other for providing a sliding fit having sufficient surface to carry the current between the brush-clamp and the bracket. These jaws are flat, to insure the best possible contact. It is obvious that one member of the brush-clamp may be common to both pairs of jaws. As illustrated, there is a flat piece of brass c, with two bolts projecting on opposite sides from the center thereof, one bolt (1 being a rounded bolt with a threaded end, and the other, e, a flattened bolt provided with a round threaded end. The fiat tened bolt passes through a slot b in the bracket and the round bolt through a slot f in the brush. The slot is midway between the two ends of the brush, so that either end may be made to contact with the commuta- This arrangement secures the clamp againstdisplacement, but admits of the brush being turned end for end in the clamp upon the bolt. It also admits of the clamp being slid up and down with respect to the bracket and of the brush being adjusted up and down with respect to the clamp. To clamp the brush, a flat plate 9 is put on the end of the rounded bolt outside of the brush, and a nut h is screwed onto the end of the bolt. This gives a broad fiat contact between the brush and the clamp. To hold the clamp in place on the bracket, a fiat plate 1' is slipped onto the flattened bolt on the other side of the bracket, and a nut 70, with a notched head, is screwed onto the round threaded end of the bolt. This nut is locked in position by a spring Z, which is attached to the plate and engages with the notches in the head of the bolt. The fit between the clamp and the bracket has a graduated adjustment by means of the notched nut, and an accurate sliding fit can be thereby secured and retained. This insures a perfect bearing of the brush on the commutator. There is thus a fiat sliding contact between the bracket and the clamp. The plates forming the jaws of the clamp are called ICO contact-plates. The brushes thus clamped are pressed down against the commutator by fiat bowed springs m, which are held by thumb-screws n on the upper. edge of the bracket. The ends of these springs bear in grooves in the upper edges of the contactplates 0 2', by which the brush-clamp is attached to the bracket. The tension of these springs is adjusted by thumb-screws n, which are screwed into threads cut in the upper edge of the bracket and which pass through slots 0 cut in the springs. On opposite sides of the middle point of these slots two small holes are drilled, which engage two pins 19 on the under side ofthe screw-heads, so as to prevent the screws frorn shaking out of position. To effect readjustment, the springs are released from the screws by pressure, the screws then turned to any desired, position, and the springs slipped back into place in engagementwith the screws. These springs push the brush-clamps down until the brushes press on the commutator and byproper adjustment of the ditl'erent springs uniform contact at the different brushes is secured.

It is obvious that changes may be made in the form shown without departing from the spirit of my invention.

hat I claim, and desire to secure by Letters Patent of the United States, is-

1. The combination of a bracket, one or more brush-clamps mounted thereon, there being a sliding contact between the clamp and the bracket, and a lock-nut for graduated adjustment of the contact between the bracket and the clamp, substantially as described.

2. The combination of a bracket, a brushclamp supported therebyand provided with flat jaws, a fiat reversible brush slotted midway between the two ends and engaged by the jaws, and a bolt through the slot in the brush for clamping the brush between the jaws, substantially as described.

The combination of a bracket provided with flat contact-faces, and one or more brushclamps mounted to slide upon the bracket,

each brush-clamp being provided with two pairs of flat jaws, one pair for a sliding fit with the bracket and the other pair for clamping the brush, substantially as described.

4:. The combination of a bracket provided with fiatcontact-faces,and one or more brush-' clamps mounted to slide upon the bracket, each brush-clamp being provided with two pairs of flat jaws, one pair for a sliding fit with the bracket and the other pair for clamping the brush, there being a cdntact plate common to the two pairs of jaws, substantially as described.

5. The combination of a bracket provided with fiat con tact-faces, and one or more brushclamps mounted to slide upon the bracket, each brush-clamp being provided with two pairs of flat jaws, one pair for a sliding fit with the bracket and the other pair fer clamping the brush, and a spring supported from the bracket and bearing upon each brushclamp, substantially as described.

6. The combination of a bracket provided with two flat contact-faces, one or more brushclamps, each consisting of two pairs of jaws one for clamping a brush and one for providing a sliding fit with the bracket, the brushclamp being attached by a bolt passing through a slot in the bracket, and a spring of adjustable tension bearing upon the brushclamp, substantially as described.

7. The combination of a bracket, one or more brush-clamps mounted to slide upon the bracket, a bowed spring for each brush-clamp,

.an adjusting-screw for regulating the tension of each spring, the spring being slotted for the passage of the head of the screw, and a lock between the screw and spring, substantially as described.

Signed by me in Bostomhlassachusetts, this 11th day of March, 1889.

PATRICK OSHAUGHNESSY.

Witnesses:

LOUIS ARNOLD, W. S. TUBMAN. 

